Flip-up gun sight



FIG. 1 is a rear view of a flip-up gun sight showing my new design,wherein a partial view of the rear portion of a hand gun is shown inbroken lines for illustrative purposes only and forms no part of theclaimed design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a left side view thereof.

CLAIM The ornamental design for a flip-up gun sight, as shown anddescribed.